Underfeed stoker.



W. J. KENNEY.

UNERFEED STOKEH. APPLICATION man ocr. 10.1914.

ll l hl llJlLllAt'l". d'. KENNEY, OE WILMETTE, ILLINIES, ASSGTOR T 'UNDER STGKlEli-t COMPANY' U1 MELEHC., OF CHCAG, lElILINS, di GEtPltATON DIF lll: W JERSEY.

'UNEEERFED STDERR.

Specification of Letters @atenta Application led ctober 10, 1.914. Serial No. See?.

To all whom it 'may concern Be it known that l, VllrLLIAM J. Kenner, a citizen of the United States, residing` at llltilmctte, county of Cook, and dtat'e ot 5 .lllinois, have invented a. certain new and useful lmprovement in Underteed Stokers, and declare the following to be ay full, clear, and exact description of the same, such as will enable others skilled in the art towhich it pertains to make and use the same, reterence being had to the accompanying d awings, which form a part of this specification. ln underfeed stokers of the self-cleaning type wherein the dead plates on opposite sides ot the retort are perforated for the passage of movable dogs and the air to support combustion is introduced under pressure into the chamber beneath thevdead plates, it sometimes happens that too much air flows up through the spaces in the dead plates surrouriding` the dogs, thus *causing a reduction in the pressure at the twyer blocks and in the relative amount of air passing through them. lt is necessary, however, to cool the dead plates in some manner, the use for this purpose of the air which sup ports combustion being' of course the sim plest and most ellicient; and the object of the present invention is to provide simple land effective means i'oipeiinitting the use ot the air which supports combustion 'lor cooling the dead plates, without danger oi disturbing the hest proportions between the r, air passing through the` twyer blocks and that passing through the perfo 'ations in the dead plates. y

Y rlhe various features of novelty whereby my invention is characterized will hereinutter be pointed out with particularity in the claims; but,.ior a full uml n.stand.ing` ot my invention ando' its object and advantages, reference ma)7 be had to the followingl detailed description` take-n in connection with the accompanying drawing, wherein: Figure l is a longitudinal vertical section taken through an under-feed Stoker apparatus arranged in accordance with one form ci mv invention, the section being,- taken approxhnatelv on line 1--1 oT' Fior, 2; Fig.

mately on line Q-2 ot Fig. l; and Fin', 3 a top plan view of a` portion of the Stoker, the front wall of the furnace heinein section, and parts heinp; broken away.

im Referring to the drawing, l represents a.

a verticaltransverse section taken approxiless rapidly than it woul furnace having therein one or more retorts, 2, provided 'with twyer blocks, El, around theirnppcr edges. .Beside the retorts are dead plates, 4, which cooperate therewith to divide the furnace into lower air chamber and an upper combustion chamber. loting in openings, 5, in the dead plates are movable dogs, (l, adapted 'to feed material overflowing thereon from the retort or retorts to a discharge point at the rear. ln the arrangement shown the dogs are arraii'ged in rows, those of each row being connected to a bar, 7, which is reciprocated through a suitable connection with a transverse rock shaft, 8. Air under pressure is introduced into the furnace beneath the dead plates., this being; convenientlyv accomplished hy connecting this part of the furnace, the air chamber, to the discharge side, S), oit a blower.

All ot the parts heretofore descrihcd are of old and well known construction and are simply intended as an illustration ot a class ot existing apparatus.

As I have heretofore explained, in stokers of this kind conditions sometimes arise in which too much of the air escapes into the combustion chamber through the openings in the dead plates and an insuliicient amount passes through the twyer blocks. l'n order to prevent this, vl provide means whereby air pressure will be manitainert4 'beneath the dead plates so that the air will iiow up through the openings and keep the plates cool, while a higher pressure will be maiutained at the twver blocks and thus insure that the desired amount ot' air Ywill flow through the twyer blocks. Looking at the matte-r in another i ay, l. `m'ovide means for maintaining the usual static pressure in that portion of the air chamber .in the Yvicinity of the i* 1et ends ot the twjver hloeks and a smaller but still an appreciable pressure in the. vicinity oit the dead plates.

I accomplish the above end by placing beneath each dead plate a partition which cuts oli" 'from the main portion ot the air chamber a section in the innnediate vicinity of the dead plate,` the parti-tion heine; perforated so as to let air pa,C h rethrough l1 the openings 'in the dead platee at the pressure in the main portion. ot the air chamber." this way 'the partition serves a l valve which maintains a lower pressure .tu

lOO

./tween opposite sides thereof.

In the arrangement illustrated, the partitions take the forni of sheet metal casing's, 3.0, deep enough 'to give free play to the operatingr connections for the dogs. Each casing has a. downwardly-projecting part, 11, embracing the corresponding rocker arm, l2, of the cleaning mechanism7 and having an opening, 13, in the extren'ie lower end. The opening, 137 permits ashes to drop down and air to enter. The jfront end ot eaehcasing made iiijiwardly inclined and is provided with a door, H7 giving; areess to ythe interior. ln the bottoni of each easing', near the rea r end, is a sliding` door or valve, l5, adapted to be operated by meansof a rod, 16, extending to the front of the 'iurnace. The valve or door, 15, permits the easing' to be cleaned and alSo serves as regni lating valve for varying the amount of air. which can fion' through the dead piates.

While have illustrated and described in detail only a single preferred form of. my' invention, I do not desire to be limited to the structural details .thus iliustrated and deeeribed; 'but intend to cover ail 'forme and arrangements which come within the 'terms employed in the definition of my invention constituting the appended claims.

l claim; y l. In Combination, a furnace, a retort and momes supports beside the saine dividing the fur nare .into an upl ,r combustion Chamber and a lower air chamber, twyer blocks on the retort communicating at their inlet ends with said air chamber, said supporte haw ing,- openings therethrough, means for admitting air 'under pressure to said air cham bei', and partitions separating the space proximate to the under :side of the .Supports from the remainder oif' the chamber, said partitions haring openings therethrough, and a manually operated valve for controlling said openings.

2. ln Combination, a furnace, a retort and supports beside the saine dividing.; the furnace into an upper Combustion chamber and a lower air Chamber, tngrerbloelis on the retort coinn'iunieating at their inlet ends with said air chamber, Said supports har ing openings therethrough, means vtor arlnlitting;r air under preseure to said air lian1 ber, and partitions, separating the spare proximate to the under side of the Supports from the remainder ot the chamber, said partitions having small openings therein through which air can flow in suilioient quantities to maintain a. slight iniwssure lirneatli said supports. said partition also haring large openings therethrough, and valves for Controlling said large openings,

ln testimony whereof, l eign thisI perilitation in the presence of two \\'itne.e.\1e 

